20143321 has 4 divisors (see below), whose sum is σ = 21974544. Its totient is φ = 18312100.

The previous prime is 20143301. The next prime is 20143327. The reversal of 20143321 is 12334102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20143321 - 2¹⁵ = 20110553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20143295 and 20143304.

It is not an unprimeable number, because it can be changed into a prime (20143327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 915595 + ... + 915616.

It is an arithmetic number, because the mean of its divisors is an integer number (5493636).

Almost surely, 2^20143321 is an apocalyptic number.

It is an amenable number.

20143321 is a deficient number, since it is larger than the sum of its proper divisors (1831223).

20143321 is a wasteful number, since it uses less digits than its factorization.

20143321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1831222.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20143321 is about 4488.1311255354. The cubic root of 20143321 is about 272.0886074136.

Adding to 20143321 its reverse (12334102), we get a palindrome (32477423).

It can be divided in two parts, 2014 and 3321, that added together give a palindrome (5335).

The spelling of 20143321 in words is "twenty million, one hundred forty-three thousand, three hundred twenty-one".